Susan Jacoby on the religion blog at The Washington Post argues that burning sacred books (or any books for that matter) is anti-intellectual, even when it's endorsed by fellow atheists:
Burning books--and yes, ripping out offensive pages--is designed to express contempt, whether the contempt emanates from an individual or a government. It is also an expression of the intellectual bankruptcy of the practicioner [sic]
She sees book-burning as evidence of dialogic laziness. The real rhetorical work of converting believers into unbelievers, in her case, requires claims backed by good reasons; to convert someone you write books, not burn them.